ENGINE AR-COMPLETE 1399990 - Caterpillar

Find and correct the problem that caused the engine to stop. This will help prevent damage to the engine from not enough lubrication or too much heat.
TEMPERATURE SHUTOFF
8. Inlet port. 9. Stem. 10. Thermostat assembly. 11. Ball.Shutoff And Alarm System Components
Oil Pressure Switch
Micro Switch Type
The oil pressure switch is used to give protection to the engine from damage because of low oil pressure. When oil pressure lowers to the pressure specifications of the switch, the switch closes and activates the rack shutoff solenoid.On automatic start/stop installations, this switch closes to remove the starting system from the circuit when the engine is running with normal oil pressure.This switch for oil pressure can be connected in a warning system for indication of low oil pressure with a light or horn.As pressure of the oil in bellows (6) becomes higher, arm (4) is moved against the force of spring (3). When projection (10) of arm (4) makes contact with arm (9), pressure in the bellows moves both arms. This also moves button (8) of the micro switch to activate the micro switch.
OIL PRESSURE SWITCH (Micro Switch Type)
1. Locknut. 2. Adjustment screw. 3. Spring. 4. Arm. 5. Spring. 6. Bellows. 7. Latch plate. 8. Button for micro switch. 9. Arm. 10. Projection of arm.Some of these switches have a "Set For Start" button. When the button is pushed in, the micro switch is in the START position. This is done because latch plate (7) holds arm (9) against button (8) of the micro switch and the switch operates as if the oil pressure was normal. When the engine is started, pressure oil flows into bellows (6). The bellows move arm (4) into contact with latch plate (7). The latch plate releases the "Set For Start" button and spring (5) moves it to the RUN position. This puts the switch in a ready to operate condition.Pressure Switch
Pressure switches are are used for several purposes and are available with different specifications. They are used in the oil system and in the fuel system. One use of the switch is to open the circuit between the battery and the rack shutoff solenoid after the oil pressure is below the pressure specifications of the switch. It also closes when the engine starts.Another use of the switch is to close and activate the battery charging circuit when the pressure is above the pressure specification of the switch. It also disconnects the circuit when the engine is stopped.Switches of this type have three terminal connections. They are used to do two operations with one switch. They open one circuit and close another with the single switch.Shutoff Solenoid
A shutoff solenoid changes electrical input into mechanical output. It is used to move the fuel injection pump rack to the off position. It can also be used to move a valve assembly in the air inlet pipe to a closed position. This stops the engine.The shutoff solenoid can be activated by any one of the many sources. The most usual are: